ESB-2018.0014 - [Appliance] F5 BIG-IP Products: Denial of service - Remote/unauthenticated - 2018-01-02


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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0014
         K70938105: Expat XML library vulnerability CVE-2016-5300
                              2 January 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           F5 BIG-IP Products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-5300 CVE-2012-0876 

Reference:         ASB-2016.0120
                   ASB-2016.0103
                   ESB-2012.1093
                   ESB-2012.0742
                   ESB-2012.0552

Original Bulletin: 
   https://support.f5.com/csp/article/K70938105

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K70938105: Expat XML library vulnerability CVE-2016-5300

Security Advisory

Original Publication Date: Oct 27, 2016
Updated Date: Dec 27, 2017

Security Advisory Description

The XML parser in Expat does not use sufficient entropy for hash
initialization, which allows context-dependent attackers to cause a denial of
service (CPU consumption) via crafted identifiers in an XML document. NOTE:
this vulnerability exists because of an incomplete fix for CVE-2012-0876. (
CVE-2016-5300)

Impact

An attacker may be able to cause a denial-of-service (DoS) attack via crafted
identifiers in an XML document.

Security Advisory Status

F5 Product Development has assigned ID 617273 (BIG-IP), ID 617964 (BIG-IQ/F5
iWorkflow), ID 618243 (Enterprise Manager), and ID 528541 (ARX) to this
vulnerability. Additionally, BIG-IP iHealth may list Heuristic H624219 on the
Diagnostics > Identified > Medium screen.

To determine if your release is known to be vulnerable, the components or
features that are affected by the vulnerability, and for information about
releases or hotfixes that address the vulnerability, refer to the following
table:

+---------------+----------------+-----------------+----------+----------------+
|               |Versions known  |Versions known to|          |Vulnerable      |
|Product        |to be vulnerable|be not vulnerable|Severity  |component or    |
|               |                |                 |          |feature         |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |13.1.0           |          |XML parser Expat|
|BIG-IP LTM     |12.0.0 - 12.1.3 |11.2.1           |Medium    |library         |
|               |11.4.0 - 11.6.2 |10.2.1 - 10.2.4  |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |          |XML parser Expat|
|BIG-IP AAM     |12.0.0 - 12.1.3 |13.1.0           |Medium    |library         |
|               |11.4.0 - 11.6.2 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |          |XML parser Expat|
|BIG-IP AFM     |12.0.0 - 12.1.3 |13.1.0           |Medium    |library         |
|               |11.4.0 - 11.6.2 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP         |13.0.0          |13.1.0           |          |XML parser Expat|
|Analytics      |12.0.0 - 12.1.3 |11.2.1           |Medium    |library         |
|               |11.4.0 - 11.6.2 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |13.1.0           |          |XML parser Expat|
|BIG-IP APM     |12.0.0 - 12.1.3 |11.2.1           |Medium    |library         |
|               |11.4.0 - 11.6.2 |10.2.1 - 10.2.4  |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |13.1.0           |          |XML parser Expat|
|BIG-IP ASM     |12.0.0 - 12.1.3 |11.2.1           |Medium    |library         |
|               |11.4.0 - 11.6.2 |10.2.1 - 10.2.4  |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP DNS     |13.0.0          |13.1.0           |Medium    |XML parser Expat|
|               |12.0.0 - 12.1.3 |                 |          |library         |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP Edge    |None            |11.2.1           |Not       |None            |
|Gateway        |                |10.2.1 - 10.2.4  |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP GTM     |11.4.0 - 11.6.2 |11.2.1           |Medium    |XML parser Expat|
|               |                |10.2.1 - 10.2.4  |          |library         |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP Link    |13.0.0          |13.1.0           |          |XML parser Expat|
|Controller     |12.0.0 - 12.1.3 |11.2.1           |Medium    |library         |
|               |11.4.0 - 11.6.2 |10.2.1 - 10.2.4  |          |                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |          |XML parser Expat|
|BIG-IP PEM     |12.0.0 - 12.1.3 |13.1.0           |Medium    |library         |
|               |11.4.0 - 11.6.2 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP PSM     |11.4.0 - 11.4.1 |10.2.1 - 10.2.4  |Medium    |XML parser Expat|
|               |                |                 |          |library         |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP         |None            |11.2.1           |Not       |None            |
|WebAccelerator |                |10.2.1 - 10.2.4  |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|               |13.0.0          |                 |Medium    |XML parser Expat|
|BIG-IP WebSafe |12.0.0 - 12.1.3 |13.1.0           |          |library         |
|               |11.6.0 - 11.6.2 |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|ARX            |6.2.0 - 6.4.0   |None             |Low       |XML parser Expat|
|               |                |                 |          |library         |
+---------------+----------------+-----------------+----------+----------------+
|Enterprise     |3.1.1           |None             |Medium    |XML parser Expat|
|Manager        |                |                 |          |library         |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Cloud   |4.0.0 - 4.5.0   |None             |Medium    |XML parser Expat|
|               |                |                 |          |library         |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Device  |4.2.0 - 4.5.0   |None             |Medium    |XML parser Expat|
|               |                |                 |          |library         |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Security|4.0.0 - 4.5.0   |None             |Medium    |XML parser Expat|
|               |                |                 |          |library         |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ ADC     |4.5.0           |None             |Medium    |XML parser Expat|
|               |                |                 |          |library         |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ         |5.0.0 - 5.1.0   |                 |          |XML parser Expat|
|Centralized    |4.6.0           |None             |Medium    |library         |
|Management     |                |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Cloud   |                |                 |          |XML parser Expat|
|and            |1.0.0           |None             |Medium    |library         |
|Orchestration  |                |                 |          |                |
+---------------+----------------+-----------------+----------+----------------+
|F5 iWorkflow   |2.0.0 - 2.0.1   |None             |Medium    |XML parser Expat|
|               |                |                 |          |library         |
+---------------+----------------+-----------------+----------+----------------+
|LineRate       |None            |2.5.0 - 2.6.1    |Not       |None            |
|               |                |                 |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+
|Traffix SDC    |None            |5.0.0            |Not       |None            |
|               |                |4.0.0 - 4.4.0    |vulnerable|                |
+---------------+----------------+-----------------+----------+----------------+

Security Advisory Recommended Actions

If you are running a version listed in the Versions known to be vulnerable
column, you can eliminate this vulnerability by upgrading to a version listed
in the Versions known to be not vulnerable column. If the table lists only an
older version than what you are currently running, or does not list a
non-vulnerable version, then no upgrade candidate currently exists.

To determine the necessary upgrade path for your BIG-IQ system, you should
understand the BIG-IQ product offering name changes. For more information,
refer to K21232150: Considerations for upgrading BIG-IQ or F5 iWorkflow systems
.

Mitigation

None

Supplemental Information

  o K9970: Subscribing to email notifications regarding F5 products
  o K9957: Creating a custom RSS feed to view new and updated documents
  o K4602: Overview of the F5 security vulnerability response policy
  o K4918: Overview of the F5 critical issue hotfix policy
  o K167: Downloading software and firmware from F5
  o K13123: Managing BIG-IP product hotfixes (11.x - 13.x)
  o K9502: BIG-IP hotfix matrix
  o K15106: Managing BIG-IQ product hotfixes
  o K15113: BIG-IQ hotfix matrix
  o K12766: ARX hotfix matrix

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